A fractionated analysis of hot and cool self-regulation in cigarette smokers from different socioeconomic backgrounds.

To estimate the number of participants we would need to detect cognitive changes with at least large effect sizes we used GPower [ 129 ] considering a priori analysis with covariates (ANCOVAs as it does not compute information for GLM), two groups (smokers and non-smokers) and two continuous predictors (SES and one other, on average, which we believed might be significant even though we selected smokers and non-smokers to be as alike as possible).

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